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Bitcoin vs. altcoins: Where will Q3 crypto gains come from?

Bitcoin vs. altcoins: Where will Q3 crypto gains come from?

Key Takeaways
Bitcoin has notched a fresh all-time high, pulling altcoins up with it. But can BTC hold dominance, or will a rotation into alts push BTC.D lower?

Zooming in, Bitcoin [BTC] is consolidating at the $120k support, using it as a launchpad, and validating the structure with back-to-back all-time highs, the latest breaching $123K. 
Q3 Crypto Outlook
However, an intraday pullback of 1.47% signals weak follow-through momentum. The result? BTC’s market cap retraced from $2.46 trillion to $2.41 trillion, marking a $50 billion contraction.
Meanwhile, the broader crypto market tracked this move, slipping from $4.20 trillion to $4.15 trillion, also a $50 billion dip. That means this pullback is almost entirely BTC-driven, with dominance down 0.54%.
Source: TradingView (BTC.D)
This divergence is notable for traders tracking market flows. 
As the chart illustrates, Bitcoin dominance (BTC.D) has carved out a third lower low in the past two weeks, despite BTC itself rallying nearly 6%.
Simply put, while Bitcoin is in a phase of price discovery, capital is rotating into altcoins. Backing this, TOTAL2 (market cap ex-BTC) has breached $1.65 trillion for the first time since 2021, signaling relative strength.
BTC hits ATH, but will Alts steal the spotlight?

Bitcoin dominance is showing a gradual erosion. 
Over the past two months, BTC.D slid from 65% to 59%, even as Bitcoin rallied 15% to a $123K ATH, indicating that BTC’s gains are not fully capturing market inflows.
At the same time, the altcoin season index has surged from 16 to 59, marking a 270% surge. The result? Even speculative assets like Dogecoin [DOGE] rallied 40%+ over the same period.

A closer look at 7-day returns reinforces this trend: Ethereum [ETH] was up 25.5%, Ripple [XRP] gained 16.2%, and Solana [SOL] rose 13.6%, reflecting an elevated speculative bid and momentum building in higher-beta alt assets.
In essence, while BTC carves out new all-time highs, capital is actively rotating into alternative assets, with the altcoin season index just 22 points shy of signaling a full-blown “altcoin season.”
The impact on Bitcoin? BTC dominance is under pressure and could test deeper lows. Price discovery is still led by BTC, but altcoins are grabbing the lion’s share of flows, making them a stronger Q3 play.

Next: Assessing how Stellar [XLM] could rally 25% if THIS level breaks

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